Izani Felrys, Reckless Fist

Vigilance, Flash
If this card is countered, deal 5 damage to
the caster. Put Izani on the bottom of the library.
{5}: Deal 5 damage to target creature or player.
If you do, and damage is dealt, Izani becomes
unblockable until the end of the turn. If damage
is not dealt, he gains double strike until the end
of the turn instead.